“ISIS is our No. 1 threat. I would knock the hell out of them. I like to do one thing at a time.”

Standard US military doctrine is to go after armed enemies while taking efforts to avoid civilian casualties when possible.

Russia’s air campaign in Syria has come under criticism for errant strikes that have hit a post office, hospitals and a marketplace.

Trump also appeared Wednesday on the radio show of conservative Alex Jones. Trump said political operative Roger Stone had arranged the interview, calling his one-time adviser a “good guy” and a “patriot” — as well as a “tough cookie.”

Asked to name the best presidents, Trump hailed Ronald Reagan as the best in the short term, before turning to the “classics.”

“You look at Lincoln and you look at Washington, you have to go with — they’re the classics. You think in terms of the great classics, you have to go with the Lincolns and the Washingtons.”

Predicting the success of his own presidency if elected, Trump concluded: “We will hopefully be right at the top of that list.”

At a speech later in the evening, Trump said the would head to Israel next month to meet with Prime Minister Benjamin Netanyahu.